ETK-2026-2467Zero's internal tracking ID, independent of the CVE number.

{
  "etk_id": "ETK-2026-2467",
  "cve_id": null,
  "display_id": "ETK-2026-2467",
  "ghsa_id": "GHSA-pxh4-856f-4h89",
  "euvd_id": null,
  "status": "published",
  "anchor_state": "awaiting_cve",
  "title": "Empty JWK HMAC key acceptance in PyJWT",
  "summary": "PyJWT through 2.13.0 can accept an empty symmetric key when it is loaded from an `oct` JWK during JWT verification. An unauthenticated attacker may create JWTs with chosen claims if the application resolves verification keys from a JWK or JWKS containing an empty key.",
  "mitigation": "Upgrade `pyjwt` to version 2.14.0. Audit JWK and JWKS sources, remove any symmetric entries with empty keys, and ensure signing secrets cannot default to empty values.",
  "vendor": "pip",
  "product": "pip:PyJWT",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        "<= 2.13.0"
      ],
      "ecosystem": "pip",
      "fixed_versions": [
        "2.14.0"
      ],
      "package_name": "pyjwt",
      "purl": "pkg:pypi/pyjwt"
    }
  ],
  "cwes": null,
  "cvss_score": 7.4,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
  "epss_score": null,
  "epss_percentile": null,
  "epss_asof": null,
  "automation": "contextual",
  "check": true,
  "check_confidence_basis": "assessed",
  "exploit": false,
  "pipeline_minutes": 10.454053216666667,
  "t0_at": null,
  "signals": {
    "check": {
      "at": "2026-10-22T17:19:19.692787+00:00",
      "days": -0.02975819622685185,
      "is_lower_bound": true,
      "measured_at": "2026-10-22T18:02:10.847550+00:00",
      "url": null
    },
    "public_poc": {
      "at": "2026-10-22T15:48:04+00:00",
      "days": -0.09313427015046297,
      "is_lower_bound": true,
      "measured_at": "2026-10-22T18:02:10.847550+00:00",
      "url": "https://github.com/advisories/GHSA-pxh4-856f-4h89"
    },
    "trigger_signal": {
      "at": "2026-10-22T15:48:04+00:00",
      "days": -0.09313427015046297,
      "is_lower_bound": true,
      "measured_at": "2026-10-22T18:02:10.847550+00:00",
      "url": "https://github.com/advisories/GHSA-pxh4-856f-4h89"
    }
  }
}